Grooved roll double-felted press for papermaking



D. E. ELY, SR

GROOVED ROLL DOUBLE-FELTEb PRESS FOR PAPERMAKING Filed Oct. 28, 1965 2 Sheets-Sheet 1 INVENTOR DONALDE. ELY. SR.

3, 1966 D. E. ELY, SR 3,268,390

GROOVED ROLL DOUBLE-FELTED PRESS FOR PAPERMAKING Filed Oct. 28, 1965 2 Sheets-Sht 2 F164 INVENTOR DONALD EELY, SR.

ATTORNEYS United States Patent 0 3,268,390 GROOVED ROLL DOUBLE-FELTED PRESS FOR PAPERMAKING Donald E. Ely, Sr., Beloit, Wis., assignor to Beloit Corporation, Beloit, Wis., a corporation of Wisconsin Filed Oct. 28, 1965, Ser. No. 505,574 6 Claims. (Cl. 162-306) The present invention relates to improvements in paper'making machines and more particularly to an improved press action and arrangement for handling a web travelling through press roll couples employing grooved rolls.

In a press couple a pair of opposed press rolls employ at least one grooved roll. The web is carried through the nip between the rolls of the press couple with the felt which supports the web engaging the grooved roll. In many structures for improved water removal, at least in the first press nips, as the web enters the press section the web is carried between opposed felts and the press couple embodies two grooved rolls to dewater from both sides.

in a press couple of the type known to the art as a suction press, where one of the rolls employs a suction gland, control of the location of the web following the press nip can easily be achieved since one section gland can slightly trail the other and the web will follow the felt engaging the roll having a trailing suction gland. This is not possible in a grooved roll arrangement and positive control of the web has heretofore not been achieved in the simple manner. In some arrangements the web has had to pass through open draws from one felt to another and open draws provide difficulties. For example control of the web can be lost through an open draw.

It is accordingly an object of the present invention to provide an improved press arrangement utilizing grooved rolls wherein positive control of the web is maintained throughout the press section.

Another object of the invention is to provide an improved arrangement of felts in a press section utilizing grooved rolls wherein the felts are so arranged that the web is positively transferred from one felt to another and under positive control by at least one felt at all times.

Still another object of the invention is to provide a felt run arrangement for a press section utilizing grooved rolls wherein improved utilization of the felts can be achieved for water removal from the web.

A feature of the present invention is to provide a press section of the papermaking machine including a first felt for carrying a web on the surface thereof, a first press roll couple receiving the felt in the nip therebetween having a grooved roll engaging the felt, a second felt in web transfer relation with the first, and a web transfer suction roll within the second felt at a transfer location following the nip transferring the web to the second felt with a second press roll couple receiving the second felt in the nip therebetween and having a grooved roll engaging the second felt with means for removing the web from the second felt.

Other objects, advantages and features will become more apparent with the teaching of the principles of the invention in connection with the disclosure of the preferred embodiments thereof, in the specification, claims and drawings, in which:

FIGURE 1 is a schematic showing of a press section embodying the principles of the present invention;

FIGURE 2 is another schematic arrangement illustrating a modified form of the invention;

FIGURE 3 is another schematic showing illustrating a further form of the invention; and

FIGURE 4 is a schematic showing of a press section illustrating another form of the invention.

32%,356' Patented August 23, 1966 FIGURE 1 shows a web W coming off of a Fourdrinier wire 10 and passing through first, second and third press nips labelled N-l, N-2 and N-3. The web is successively carried on first, second and third felts labelled F'1, F-2 and F3 whereupon it is carried to the dryer section passing over a first dryer rum 32.

In greater detail with respect to FIGURE 1, the web W is formed on the Fourdrinier wire 10 passing over a couch roll 11 and down over a turning roll 12. The web is picked off of the Fourdrinier following the couch roll 11 by a pick-01f suction roll 14 having a suction gland 1 5. The web is transferred to the first felt 13, F-1 and is carried on the lower surface thereon into the first nip N-l. The first nip is defined by a press roll couple including a grooved roll 16 and a grooved roll 17. The grooved roll 16 engages the first felt 13 F-l. The felt 13 is guided by suitable rolls not numbered and is dewatered in the nip of a press couple formed by the roll 16 and a roll 18.

The web is sandwiched between the first felt F-l and a second felt F-2 which also passes through the first nip N-l.

Following the nip N-1 the web W is positively transferred to the second felt F-Q by transfer means in the form of a suction transfer roll 20 having a suction gland 21 therein. The transfer roll 20 is located within the loop of the felt F-Q and assures that the web will follow on the surface of the felt 1 2 when the first felt F-wl is separated from it and passes upwardly around a roll 22. It is recognized that the web W already is on the second felt 1 2 so that there is no transfer in the sense of a displacement across an open space but the term transfer is used in the sense of transferring positive control of the web. In other words as the web leaves the nip N-l it is sandwiched between the two felts F1 and F-2 and not under the positive control of one more than the other. At the transfer roll 20 positive control is transferred to the second felt F-2.

The web is then carried on the felt F2 into a second nip N-2. The second nip is defined between a press roll couple including grooved rolls 23 and 24 with the roll 24 engaging the second felt F-2 and the roll 23 engaging the third felt F-3. The second felt is separated from the third felt by passing down over a roll 19 and passes into a nip between press rolls 24 and 2 5 for dewatering. Suitable additional unnumbered guide and tension rolls are provided for the second felt couple F-2.

The web is positively transferred to the third felt F-3 at a transfer location following the second nip N-2 by a suction transfer roll 26 having a suction gland 27 therein. Following the transfer location of the roll 26 the web follows the third felt F3 into a third nip N3. The third nip is defined between rolls 27 and 28 of a press roll couple with 27 being a grooved roll engaging the felt and 28 being a plain roll engaging the web. Following the nip N-3 the web adheres to the plain roll 28 and is separated therefrom across an open draw to pass into the nip between rolls 30 and 3-1. A doctor 29 engages the sunface of the roll 28 to insure web separation and to clean the roll surface. The web then is carried down over the surface of the dryer drum 3?. into the dryer section of the machine.

Above the roll 27 of the press couple forming the third nip N3 is a felt press roll 29 receiving the third felt F-3 therebetween for drying.

Thus the web has been under positive control entirely through the travel in the press section and the felts have been arranged so that no open draws are necessary and the web is transferred at optimum locations.

In the arrangement of FIGURE 2, the web W is transferred from a Fourdrinier wire 33 which passes over a couch roll 34 onto a second felt F-2. The upper felt in this instance is termed the second felt inasmuch as it passes through a first nip N- l and a second nip N-2 and a. first felt F-l is used merely for supporting the underside of the web in the first nip N-1.

The second felt F-Q picks off the web from the Fourdrinier wire 33 by means of a pick-oi? roll 35 having a suction gland 36. The first nip N1 is defined between a press roll couple having grooved press rolls 36 and 37 with the upper roll 36 engaging the felt F4 and the lower roll 37 engaging the felt F-l.

Following the [first press nip N-1 the web is positively transferred to the second felt F-2 by a suction transfer roll 38; While other transfer means may be employed, in the present disclosure the preferred form is shown as being a suction transfer roll within the felt to which the web is to be transferred.

The web is then carried on the lower surface of the second felt F-2 into a second nip N 2 defined between press rolls 40 and 41. The upper roll 46 is a grooved roll engaging the second felt F-2, and the lower roll 41 is a plain roll. The web follows the felt F-@ and if needed a suction transfer roll 40a may be positioned within the felt loop immediately following the nip N-Z to insure that the web does not follow around with the plain press roll 41. Following the nip N2 the web W is transferred to a third felt F-3. Transfer is accomplished by a suction transfer roll 42. having a suction gland therein and located within the third felt F-3.

The web then follows the felt F-3 into a third nip N-3 defined between press rolls 44 and 45. The press roll 45 is grooved and engages the felt F-3, and if desired a suction transfer roll 46 may be located within the felt F-3 immediately following the nip N-3 to insure that the web follows the felt. The web is removed from the felt N3 by a suitable means, or in the alternative is taken off of the plain roll 44 to go to the dryer section of the machine.

In the arrangement of FIGURE 3, the web is picked off a Fourdrinier wire 50 transferred onto a first felt F-1 by a suction pick-off roll 51. Since this felt F-l is received only by the first nip N-l it is termed the first felt rather than the second felt as in the arrangement of FIG- URE 2.

In FIGURE 3 the web carried on the lower surface of the first felt enters the first nip N1 defined between press rolls 52 and 53, each of which are grooved rolls. The web is sandwiched between the first felt F-1 and a second felt F-Q.

Following the first press nip N-I the web is positively transferred to the second felt by a suction transfer roll 54. The web is carried into a second nip N-2 defined between a plain press roll 55 and a grooved roll 56 which engages the second felt F-2. Following the second nip N-2 the web is positively transferred to a third felt F-3 by a suction transfer roll 57 Within the third felt.

The Web is then carried into a third nip N-3 between a grooved roll 58 engaging the felt F-3 and a plain roll 59. The Web follows the surface of the plain roll 59 over a guide roll 60 to the dryer section of the machine.

Thus by contrast, FIGURE 1 involved three nips with two double felt nips and a single felt nip. FIGURE 2 involved one double felt and two single felt nips. FIG- URE 3 involved on double felt and two single felt nips. FIGURE 4 involves two single felt and one double felt mp.

In the arrangement of FIGURE 4 the web is transfered off of a Fourdrinier wire 61 onto a second felt F-2 by a suction pick-off roll 62. Again, the felt to first receive the web is referred to as the second felt F-2 and as much as it passes through both the first and second nips N11 and N-Z.

The web is sandwiched between a first felt F-1 and the second felt F-2 in the first nip N1 which is defined between grooved rolls 63 and 64.

The web is positively transferred, or positive control is assumed by the second felt F- Z following the first nip N-l by a suction transfer roll 65 located Within the second felt.

The web is then carried into the second nip N-2 defined between a grooved roll 67 engaging the second felt F-(Z and a plain roll 67. The web will leave the nip N 2 following the felt and it may be necessary to insure positive control that the nip is followed by suction transfer roll 71.

The web is then transferred to a third felt F-3 by a suction transfer roll 68. The web is carried into a third nip N3 on the third felt E3.

The third nip N-3 is defined beween a plain press roll 69 and a grooved roll 70. Means are then provided to remove the web from the thirdfelt F-3.

It will be understood that each of the suction transfer rolls of each figure, such as roll 20 of FIGURE 1 or roll 65 of FIGURE 4 for example, has a suction gland which preferably extends past the location where the felts separate to insure positive adherence of the Web to the felt backed by the transfer roll. The drawings are of course schematic.

Thus, it will be seen that I have provided an improved press concept which meets the objects and advantages above set forth. The web is under positive control at all times during the transferral through the press section Without open draws and in accordance with the concepts of the invention various arrangements may be employed depending upon the requirements for dewatering different webs depending upon the operating factors involved.

The drawings and specification present a detailed disclosure of the preferred embodiments of the invention, and it is to be understood that the invention is not limited to the specific forms disclosed, but covers all modifications, changes and alternative constructions and methods falling within the scope of the principles taught by the invention.

I claim as my invention:

1. In a press section of a papermaking machine, in combination,

a first felt for carrying a web on the surface thereof,

a first press roll couple receiving the felt in the nip therebetween and having a grooved roll engaging the felt,

a second felt in Web transfer relation with the first felt,

a first web transfer suction roll within the second felt at a web transfer location following the first press nip transferring the web to the second felt,

a second press roll couple receiving the second felt in the nip therebetween and having a grooved roll engaging the second felt,

a third felt in web transfer relation with the second felt,

a second web transfer suction roll within the third felt at a transfer location following the second press nip transferring the web to the third felt,

and a third press roll couple receiving the third felt in the nip therebetween and having a grooved roll engaging the third felt.

2. In a press section of a papermaking machine, in

combination,

a first felt for carrying a web on the surface thereof,

a first press roll couple receiving the felt in the nip therebetween and having a grooved roll engaging the felt,

a second felt in web transfer relation with the first felt,

a first web transfer suction roll within the second felt at a web transfer location following the first press nip transferring the web to the second felt,

a second press roll couple receiving the second felt in the nip therebetween and having a grQQVfid. 0 .1 engaging the second felt,

and means for removing the web from the second felt.

3. In a press section of a papermaking machine, in

combination,

a first felt for carrying a web on the surface thereof,

a first press roll couple receiving the felt in the nip therebetween and having a grooved roll engaging the felt,

a second felt in web transfer relation with the first felt,

transfer means at a position following the first press nip transferring the web from the first to the second felt,

a second press roll couple receiving the second felt in the nip therebetween and having a grooved roll engaging the second felt,

and means for removing the web from the second felt.

4. In a press section of a papermaking machine, in

combination,

a first felt for carrying a web on the surface thereof,

a second felt in web transfer relation with the first felt,

a first press roll couple receiving said first and said second felts in the nip therebetween and having grooved rolls engaging the felts with a web between the felts,

a first web transfer suction roll within the second felt at a transfer location following the first nip transferring the web to the second felt,

a third felt in web transfer relation with the second felt,

a second press couple receiving said second and third felts in the nip therebetween and having grooved rolls engaging said second and third felts,

and a second web transfer suction roll within said third felt at a transfer location following said second nip transferring the Web to the third felt.

5. In a press section of a papermaking machine, in

combination,

a first felt for carrying a web on the surface thereof,

a first press roll couple receiving the felt in the nip therebetween and having a grooved roll engaging the felt,

a second felt in web transfer relation with the first felt,

means carrying a web and first delivering the web to said second felt with the web being received by the first felt in the press nip,

a first web transfer suction roll within the second felt following the press nip positively transferring the web to the second felt,

and a second press couple receiving the second felt and the web carried thereby following said web transfer suction roll.

6, In a press section of a papermaking machine, in

combination,

a first felt for carrying a Web on the surface thereof,

a first press roll couple receiving the felt in the nip therebetween and having a grooved roll engaging the felt,

a second felt in web transfer relation with the first felt,

means first delivering the web to said second felt,

a first web transfer suction roll within the second felt at a transfer location following the first nip positively transferring the web to the second felt,

the second press roll couple receiving the second felt with a grooved press roll engaging the felt,

a third felt in web transfer relation with the second felt,

second web transfer suction roll within the third felt at a transfer location following the second press nip transferring the Web to the third felt,

and a third press roll couple receiving the third felt and having a grooved roll engaging the felt in the nip therebetween.

References Cited by the Examiner UNITED STATES PATENTS 1,599,503 9/ 1926 Tompkins 162--360 X 1,991,346 2/1935 Ellis 162-660 X 2,618,205 11/ 1952 Heys 162-360 X 2,653,523 9/ 1953 Hornbostel l62360 X 2,694,348 11/ 1954 Beachler 162360 X DONALL H. SY LVESTER, Primary Examiner.

J. H. NEWSOME, Assistant Examiner. 

3. IN A PRESS SECTION OF A PAPERMAKING MACHINE, IN COMBINATION, A FIRST FELT FOR CARRYING A WEB ON THE SURFACE THEREOF, A FIRST PRESS ROLL COUPLE RECEIVING THE FLET IN THE NIP THEREBETWEEN AND HAVING A GROOVED ROLL ENGAGING THE FELT, A SECOND FELT IN WEB TRANSFER RELATION WITH THE FIRST FELT, TRANSFER MEANS AT A POSITION FOLLOWING THE FIRST PRESS NIP TRANSFERRING THE WEB FROM THE FIRST TO THE SECOND FELT, A SECOND PRESS ROLL COUPLE RECEIVING THE SECOND FELT IN THE NIP THEREBETWEEN AND HAVING A GROOVED ROLL ENGAGIN THE SECOND FELT, AND MEANS FOR REMOVING THE WEB FROM THE SECOND FELT. 